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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cd0b30d7a91c0e3a40fa8571e651734013a71b5178fb96a8776643898e7c566' 
  AND token = '1MIjbGTpCbhyH9AHRvwd/9+Y83LUn0R7sahatn2Ho/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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