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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50fd99db6829a7b3b7f0e3cb2eeb15a27b599f28dfa262ef15574e72152eea45' 
  AND token = '3Hal0iLX1IoSa2M7AGGCAafz9Nl/fXnUTenxvds/16U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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