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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f3a92ab4792b41d5c353d50b2495fc0b3a7b3e64a93965693907f3b6f673a7c' 
  AND token = 'AncknRvm1kWlGvEMPuA/CcTvnSrEfv4dSJu403nR84c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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