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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6579e974f41650bef18776f9e7108a64d2549fd0ef297a60be4478d7cf993fad' 
  AND token = '3CKIC98G1CWvMydS4UK8j/7jEEg4751SvHQPHH8JAxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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