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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59c8551fa725dc2b8259defba69e61949ba1f93c039eae6ac863cb3dcc9319ae' 
  AND token = 'xaUzVtoqZ5UA5S/i8ZL0pWc2xEDW76HvIIcnQG4aVxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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