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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97045c3e7613b1ce285a3878cdf13961c12d91c4a61bff1255e0fb6be93f6eb3' 
  AND token = 'v2cQtELcbK2BcceF1lTJNGAGRThgrXZBep7NTclvpc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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