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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03aaadac20dbbaf4617b7d36546b0f36407cb3b8039abcb3551cbe7b97271372' 
  AND token = 'AESCU1vJI2I51pxzMmQ2KmP510vVc5YrgV18LKp9Mds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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