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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5d158f00c36f6d20b0385d17a72bdc718f84185d730293daeef77896fec32f2' 
  AND token = 'MpMyZb1n9lVjFv7sv6W4PmVyPROBA0vI9AR28RJXp44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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