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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff411f00dc8667ae869c63b1956a4f2a73132f1ada5df7798dd76b8221d1f7ea' 
  AND token = 't2uBJmBg14Tja8zaUgjtjYwhkmM5rUtMNXpdHpBJx6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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