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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54363ae28d808090569791f2f97f6492bb31205fdd44664b02b5c4bddea65a02' 
  AND token = 'sBV5CTlJxFBMLrnjAqZiabjk3lkm6XdgdRbAHZaUA7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}