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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f34fe7cc571b49eba6d39bb135556a32c446bc6d83d9bb05f73219b3cd643b14' 
  AND token = 'HoNLhSU8Sq1RPa/S/636vZRPc3NY2s6xK090pUsL6N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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