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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52d5db0b449e2319aaf3b219bf7e0a10d905d03495e658b5578bd8ea444ed29e' 
  AND token = 'f/um4J3Mxnm4X7C+m4EG4dLHJleUdJtR1aT73Tbbq3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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