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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '724fa76cc2600f36dd6c99a348c2fb66fa3565204a6c42ea4679be132463ed4d' 
  AND token = 'zRndsrARYDaXZ3Vxl9U6spiA5wtMdQ0e3OTFRGRnjm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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