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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f50c97470e5410be25a6fff75fc9351f5902465c6c0397c75c213768728ddfc0' 
  AND token = 'DotRyWIG/++zs5ymWcXF1NSsi+qLjf/FJ8gj7aqGNcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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