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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13a1683a589f114517b6414769a09b65a2a38e5b6068ba27c0b489f418270e78' 
  AND token = 'sMzaavgEBsDNRl/P6WoDkb8YtScVjIOYS1dCBrSXsXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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