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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c692fe609d38c14389a7aa9d6595b05d379d930603e3b4ab3c414fa9e5f58c4' 
  AND token = 's/8Psa3798lFgL/Fbt81GdzjqHn15oN4XLF+2NI8dao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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