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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fd9ae2bd9b442a1b0e9366c606d17112d4e5f72bdbb44c79426674a894e8485' 
  AND token = 'lYjLnehfKQix/qWyqL2EJOqfa+8Wq6hCRajf4lMbZXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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