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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61162215dd55fa14f783b3485ee12878d57d4e6ebc180a0f0348242b6fff7945' 
  AND token = 'OxIrnO0a3ki0Jp8f/KQEj4Cxni9bshEXQiJACFBJ1oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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