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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55c03acbfdf507da55906f97d946317380bd6ff344e2d5e70bc865a4886de4a4' 
  AND token = 'nylAYFHSbFT8EQVf6BSCPl3uisx0RK3cXJhmWt1ovDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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