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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd0047d5b1e0a0368b66ac46d419ffd1f87cb196d3613437d2ed62da428bd610' 
  AND token = '36O1/tQm6wh6NKM5Hau3UkHMwVdMvASeLqVKioV9j2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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