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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75fa8013bcde8b48ed638a0481172369e433b645ac492349c7fffc0868bb268f' 
  AND token = '56P5Hyxv1dERX6Vu3MlVka/uacj99sons0T5cjFFwNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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