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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb19cb38d5a652590e8ca7971343a6e7db8c3cc5bc4a948e2b54cb3847b7ad66' 
  AND token = 'AdwOvSmf7dKVo/1DKZxU5ppTieuOGuVCK6N1mIbx7yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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