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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15f0bbfe8cc2ceae56c1212df20d24b0a8b574b2ec745dea60b8501e0e53985e' 
  AND token = 'agXr2z726c/1cx2eHJd4GuXCcQQCBk4a3eGMhmwAuF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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