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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0db8606e52c70ead1014a03b7a7875e6d5ae8c1cefd82f61caf62dec58c2db56' 
  AND token = 'bgwjiJnUWbDBKRTRJTXO2DSDelxDGj/+zeg3EY/4uLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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