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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6bbdcff6533fb27c5c6ec3ed7fe3521610c60f7367f0afcce3954e1481dd36c' 
  AND token = 'n7QunyRRTvhIt0n149yErZ69a0OBUFTReWENfQzPJtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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