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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddc552ad3d98e041894b69b3e0f9bed35308376419aac16be708e15b58212c96' 
  AND token = 'r2dvwTatf6LixjrfC4K5tMHBLjzjULD/musk5Fri/fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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