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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1bab511718d1593404faf042cb13067c79802254fae5eb8b97945c984ec1124' 
  AND token = '2XU8NCjWGYbiX1lSJjw9N8ZvTIjKpIP4XIvX83y52qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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