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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9c47bdd1c688a8d0296b6e7b992f6384a2cc84b98a44ac4f6be32cb40e707fe' 
  AND token = 'YjyfQS2DBXoAaVETFYyRaLdmJZTqv+CBv2v66gr+Fy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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