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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b0b170cb45088ea9f80bd3383e525fe611292e8f4475d97a74c2376750a6d7e' 
  AND token = 'IzRrx9Db2QqfB2Y0CT8AfeOsYeJ7t/ZQjQNWBATps1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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