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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa94dc4ceef635520fe27cca83ea090684d8dc392ff24ae532a8baed5beed5c4' 
  AND token = 'P77kPvpL3x8ziZ0hBK/EVk7Z8/QnUAhlfx1brpMCVrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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