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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c66697f382af1c307fa8b2f824eabe81ab0421e98d2a76f8e2b06c4e7a7ba98f' 
  AND token = 'sSp/E0B2JYqDhsxsAOPRe9GONawiKWsQ3zLbHf1Fhw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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