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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55f743b149a1b7dc4bc360f6d291a49526b8d1c8a8a9cda59cb5b5a0cdbd7731' 
  AND token = 'cJ9hP8HQqxB9lT5SLh1miR/vw9N0F8/uwTNBboXqiyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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