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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88efea245f7ec9a1ee72268a2a35b9a5f460398616dbbc36d71a1134abee681e' 
  AND token = 'kUT3ur74sdOUu8XHoW2gTAEdaw+CN0c3IlLQTKEcS7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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