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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4a0caec7d3e30863d9744f82ff73118fd735b00f7c1c3b9a508b679dbb9e657' 
  AND token = 'pRn8DvH0rbPm5lUWMJO9aXuAHcoxSBi6Ygaa6g1ojWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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