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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a42919fa0488ad29b2ef8a8c618d04ccdb7daf0f3ebd8526f45313c7aa44db9' 
  AND token = 'fFkPNO4pWeRfAhWKMwh2PtskQ8AiQd9fwiyigyBlzuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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