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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b3b7f1d4a0d72b63eb7727b966d6170718b67df02e35968603bed707878a2ff' 
  AND token = 'Hzd7hLmAv4Xd1mT+Bezr4G4CWIcFnt5tZNieka0yEyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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