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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbbde5d7b04cd29d08ba734f401f53fe139c8531a20e6a2d166e926dee356f27' 
  AND token = 'n5X6+iplkV1vTvEyqTrluGHAYw5kmki0ewkR4HWqFFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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