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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e369c2ad7197f6415d13f9040369799c5e8915c897ad1c3c83e2de139a1c4d3' 
  AND token = 'T8oTpDnEdprn1d+fX0F9GWe/pp3K/8IAascDTCXJ17w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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