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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff719fc1a1c675b405a1c1efe83189845a0f57f993f6c143e7bbff761c9104ea' 
  AND token = 'd9IuBsN1Wn5Cg8Xr9PxqRHBdyxtsek10Q+F33eag1kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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