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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c07b0649db6a8e3d7fd8c79f3bac4c12d5021eeae6193dfdd4d8cc231767c479' 
  AND token = 'm6e3OBdAgq6cbF0km/qYNUnLkVHRePnMX2a5Q6IOKWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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