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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cac059b5e42f06c250a366eb6f96ce3f5b98c792a1d796143948f49f7b59de1c' 
  AND token = 'Pdjp9SVoxyKMVnDn4dSjAUng8/Nv2REYKj921RV0JPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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