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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '496cb1916576646c8b1ab6dae32c0d5dd10d4284ada2d9c7eca38055d14557b3' 
  AND token = 'RSePDMQaKUMbRQRDNTYaSqboDCuB83+kQPqyHC56Dm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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