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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5575b411b10a0da44a875da4f347bcf68130398e40750e9e82d5e1e8ff219fa' 
  AND token = 'NYISr14BcTVGmyyM0EJihaFdmM/CNxs5v5vsqplbawg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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